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http://sources.redhat.com/ml/newlib/2002/msg00230.html Stephen L Moshier wrote: > > pow(x,y) returns 0 when x is very close to -1.0 and y is very large. > The following test program prints > > pow(1.0000000000000002e+00 4.5035996273704970e+15) = 2.7182818284590455e+00 > pow(-1.0000000000000002e+00 4.5035996273704970e+15) =0.0000000000000000e+00 > pow(9.9999999999999978e-01 4.5035996273704970e+15) = 3.6787944117144222e-01 > pow(-9.9999999999999978e-01 4.5035996273704970e+15) = 0.0000000000000000e+00 > > which is incorrect for the negative arguments raised to an odd integer > power. > > ----- > double pow (double, double); > > int > main () > { > double x, y, z; > > x = 1.0 + pow (2.0, -52.0); > y = 1.0 + pow (2.0, 52.0); > z = pow (x, y); > printf ("pow(%.16e %.16e) = %.16e\n", x, y, z); > x = -x; > z = pow (x, y); > printf ("pow(%.16e %.16e) = %.16e\n", x, y, z); > x = 1.0 - pow (2.0, -52.0); > z = pow (x, y); > printf ("pow(%.16e %.16e) = %.16e\n", x, y, z); > x = -x; > z = pow (x, y); > printf ("pow(%.16e %.16e) = %.16e\n", x, y, z); > } > ----- > > Here is a patch for newlib/libm/math/epow.c: Patch checked in and duplicated for ef_pow.c. Thanks. -- Jeff J.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 15 Sep 2008 04:31:30 +0000
parents c121d94672cb
children 1bceff8f008f
line wrap: on
line source


#ifndef _directx_h
#define _directx_h

/* Include all of the DirectX 5.0 headers and adds any necessary tweaks */

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <mmsystem.h>
#ifndef WIN32
#define WIN32
#endif
#undef  WINNT

/* Far pointers don't exist in 32-bit code */
#ifndef FAR
#define FAR
#endif

/* Error codes not yet included in Win32 API header files */
#ifndef MAKE_HRESULT
#define MAKE_HRESULT(sev,fac,code) \
	((HRESULT)(((unsigned long)(sev)<<31) | ((unsigned long)(fac)<<16) | ((unsigned long)(code))))
#endif

#ifndef S_OK
#define S_OK		(HRESULT)0x00000000L
#endif

#ifndef SUCCEEDED
#define SUCCEEDED(x)	((HRESULT)(x) >= 0)
#endif
#ifndef FAILED
#define FAILED(x)	((HRESULT)(x)<0)
#endif

#ifndef E_FAIL
#define E_FAIL		(HRESULT)0x80000008L
#endif
#ifndef E_NOINTERFACE
#define E_NOINTERFACE	(HRESULT)0x80004002L
#endif
#ifndef E_OUTOFMEMORY
#define E_OUTOFMEMORY	(HRESULT)0x8007000EL
#endif
#ifndef E_INVALIDARG
#define E_INVALIDARG	(HRESULT)0x80070057L
#endif
#ifndef E_NOTIMPL
#define E_NOTIMPL	(HRESULT)0x80004001L
#endif
#ifndef REGDB_E_CLASSNOTREG
#define REGDB_E_CLASSNOTREG	(HRESULT)0x80040154L
#endif

/* Severity codes */
#ifndef SEVERITY_ERROR
#define SEVERITY_ERROR	1
#endif

/* Error facility codes */
#ifndef FACILITY_WIN32
#define FACILITY_WIN32	7
#endif

#ifndef FIELD_OFFSET
#define FIELD_OFFSET(type, field)    ((LONG)&(((type *)0)->field))
#endif

/* DirectX headers (if it isn't included, I haven't tested it yet)
 */
/* We need these defines to mark what version of DirectX API we use */
#define DIRECTDRAW_VERSION  0x0700
#define DIRECTSOUND_VERSION 0x0500
#define DIRECTINPUT_VERSION 0x0500

#ifdef __GNUC__
#define NONAMELESSUNION
#endif
#include <ddraw.h>
#include <dsound.h>
#include <dinput.h>

#endif /* _directx_h */
/* vi: set ts=4 sw=4 expandtab: */